SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c7606f66b773c3215eaa3e8758e67b6a1b632016c57c8e1bb41dcf664ffbdd' 
  AND token = 'UaysXWRSAwtFlmCRrwxDwo8Cn7e2MsKIyLATRBcu+Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables